Boring head



SePt- 16, 1952 w. H. ATKINSON v 2,610,529

v BORINg-HEAD v Filed July 5, 195o 3.0 24 Z8 a 5 fx\\\\\\\\\\\\\\\ 55 mmmw r a '4 Wil/iam H. Atkinson )IBY @,w

Attorneys Patented Sept. 16,V 1952 STATE YWilliam H. Atkinson, Jacksongll/iss.,assigner 'of Y- Y l one-third to L. M. ConkwrightpfklahomaCity, i i l, v ,Y g v Okla.

This invention comprises ri'ovel'andy usefulv improvementsin'boring heads, and more particularly pertains Ito a boring head which will cut an axial' guide core `the ,member whiclfiV isbeing p drilled.- '1 Y y important object of thisinvention is' to vprovide a boring head which will more accurately and'with greater facility cut a bore in a member. 'Another important objectv of this invention is to provide a',V boring head, in accordancewith the foregoing y-'c` bjects, which will cut an axial guide core in a member whereby the volume-of material: being cutffor a given sized bore, will be reduced, .thereby reducing r'th'efenergy required to drill thebore, 'and which guide core will also serve to guidethe head axially throughlthe member,

Yet another'object ofrthis invention is tovprovide aboring head, inlaccordance withlthe'foregoing-objects, in which a',k tubularaboring stem which is l.attached to the head will receive the guide .core-and'alsoprovide a conduit for lubricant tothe boring head cutter. f

An. important feature of this invention resides I in'theiprovision of a boring. head having a pluralby the une 2-2 of Figure 1;

Applicata@ Jelyai'ssaseriemenasse M D A Y soieims. loma-68) f Figure?J is anend elevational View of the boring head takensubstantially upon the'planeindicated Figure 3 is a transverse sectional view, taken substantially on the plane 3-3 of Figure 1;A

Figure 4' isa transverse sectional View, taken substantially' on theplane 4-4 of Figure 1;

Figure 5 is a frgamentary longitudinal sectional view of the boring head, shown cutting a member and forming an axial guide core; and Y 1 Figure 6 is a perspective elevational View of one of the cutters. y

It has been found that anelongated member may be more accurately bored if there is utilized a boring head which will form an axial guide core in the member being bored, whichguide core will guide the head during the 'boring operationjllt has furtherk been found thatithe using of'such a boring head reduces the amount of power 'necessary to produce a 'givendrilling operation, since,

as will be readily appreciated, a lesser volume of material .must be cutand removed by the cutters ters, and which head has an axial guide bore Y therein and a tubular drill stern attached to theV head'and having aninternal ,diameter greater than that of the guide ibore, the lubricating bore communicating with the stem, whereby a guide core infa member cut by theboringhead will be snuglyreceived in the guide bore of the head, but will be spaced from the walls of the drill stem', so that .lubricant may be forced between the stem and the guide core, into the lubricating bores and out through the forward end ofthe cutting head.

Another important feature of this invention rev sides in the provision ofa boring head having an axial guide bore therein, with a guide bushing disposed in the guide bore, and cutters detachably mounted in the head and engaging the bushing, to limit movement of head, StilLanother featurexof this invention resides in the provision of a boring head having a plurall ity of,l circumferentially spaced ribs, with cutters the bushing relative to the Y vand a trailing redge it.

when any axial guide core is formed, than is cut and removed whenlno guidecore is formed.

There has accordingly been'provided a boring head, indicated'g'enerally by the numeral IILand shownfin the accompanying drawings to which reference is'no'w made, and in which like numerals designate similar parts lthroughout the variousviews. The boring Vhead I0 has'a plurality of circumferentially spaced, and substantially V- shaped chip flutes l2 having a leading edge l@ As will be appreciated from aconsideration ofthe accompanying drawings, theleading'and'trailing edges of adjacen flutes .dene ribs I8 therebetween; A The head IB is also provided with an axial bore 20, in which is disposed a bushing '22, 4and which bushing extends `sulistantially the entire length oftheriblS. Y 1' Each of the ribs I8 is provided'with a longitudinally extending slot 24, adjacent the forward end thereof, which slot opensforwardly and outwardly of the boringhead it, and which slots terminatein spacedrelation to'the guidebore, and deningan inner wall 26 therebetween. For reasons whichv will later become apparent as the following description proceeds', thefhead l is also traversely g'rooved,v asl atl 28, adjacent the forward cutting'end of the head lil, which groove communicates the slots 24 with the guide bore 2li.

A substantially vV-sh-aped cutter 30 having an arcuate outer reaming edge32, afo'rward'cutting edge 34 and an inner roaming edge 36 is disposed in the slot 24, the outer reaining` edge 32 terminating substantially ush with rthe arcuate outer surface 38 of the rib I8, while'the inner roaming edge 36 terminates flushV with'the inner surface 

